16218971 has 2 divisors, whose sum is σ = 16218972. Its totient is φ = 16218970.

The previous prime is 16218967. The next prime is 16218977. The reversal of 16218971 is 17981261.

It is a weak prime.

It is an emirp because it is prime and its reverse (17981261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16218971 - 2² = 16218967 is a prime.

It is a Chen prime.

It is a plaindrome in base 14.

It is not a weakly prime, because it can be changed into another prime (16218977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8109485 + 8109486.

It is an arithmetic number, because the mean of its divisors is an integer number (8109486).

Almost surely, 2^16218971 is an apocalyptic number.

16218971 is a deficient number, since it is larger than the sum of its proper divisors (1).

16218971 is an equidigital number, since it uses as much as digits as its factorization.

16218971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 35.

The square root of 16218971 is about 4027.2783613751. The cubic root of 16218971 is about 253.1285311909.

The spelling of 16218971 in words is "sixteen million, two hundred eighteen thousand, nine hundred seventy-one".